LogContext: Fix a bug where multiple logs with similar nanosecond timestamps were loaded too often

[svennergr]

What is this feature?
In some occasions and due to the fact that requests in Grafana are based on miliseconds, Loki will return the same log liens as already present in the LogContext component. For such cases it is not enough to only compare the ref-logline but we would need to filter out all logs that are already present.

Special notes for your reviewer:

1. I will remove the data.js change after review, but that should help you create the edge case.
2. Query logs with {place="moon",time="ns"} | line_format "{{__timestamp__}}"

Without the fix:

Screen.Recording.2023-07-11.at.07.41.29.mov

With the fix:

Screen.Recording.2023-07-11.at.07.42.38.mov

[gabor]

LGTM 👍

[grafana-delivery-bot]

The backport to v10.0.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-71319-to-v10.0.x origin/v10.0.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x 212239aedbabacdca2309feedbda2dc72d88ddb5
# When the conflicts are resolved, stage and commit the changes
git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Create the PR body template
gh pr view 71319 --json body --template 'Backport 212239aedbabacdca2309feedbda2dc72d88ddb5 from #71319{{ "\n\n---\n\n" }}{{ index . "body" }}' > .pr-body.txt
# Push the branch to GitHub and a PR
gh pr create --title "[v10.0.x] LogContext: Fix a bug where multiple logs with similar nanosecond timestamps were loaded too often" --body-file .pr-body.txt --label "type/bug" --label "area/frontend" --label "add to changelog" --label "area/logs" --label "backport" --base v10.0.x --milestone 10.0.x --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# If you don't have the GitHub CLI installed: Push the branch to GitHub and manually create a PR:
git push --set-upstream origin backport-71319-to-v10.0.x
# Remove the local backport branch
git switch main
git branch -D backport-71319-to-v10.0.x

Unless you've used the GitHub CLI above, now create a pull request where the base branch is v10.0.x and the compare/head branch is backport-71319-to-v10.0.x.